Quantum Noise as an Entanglement Meter
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Klich-2009-Quantum Noise as an.pdf
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Author(s)
Klich, Israel
Levitov, Leonid
Date Issued
March 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Klich, Israel , and Leonid Levitov. “Quantum Noise as an Entanglement Meter.” Physical Review Letters 102.10 (2009): 100502. © 2009 The American Physical Society.
Version
Final published version
Abstract
Transport in a quantum point contact (QPC) can be used to generate many-body entanglement of Fermi
seas in the leads. A universal relation is found between the generated entanglement entropy and the
fluctuations of electric current, which is valid for any protocol of driving the QPC. This relation offers a
basis for direct electric measurement of entanglement entropy. In particular, by utilizing space-time
duality of 1D systems, we relate electric noise generated by opening and closing the QPC periodically in
time with the seminal S=1/3 logL prediction of conformal field theory.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.102.100502
